RealNav navigation..

[don1reed]

woops...typo. Meant East of England. tnx Georg.

And tnx, van, for the explanation. I'll have to fumble around with it abit to get my sea-legs adjusted.

-...-

Georg, the date & time is correct as my pic shows; however, my Windows/print screen function peeled away some of the sun-glare and shows the Sun's position in the middle of the screen (roughly) where I believe, van, is referring with his pic. As you can see, the "Navigator's Star Finder" shows Hc for the Sun as 20° 21.0'. The closest I could get to that was about 29°...also show on my pic. 9° off (540nm) is not too good.

The non-linearity of the screen is (no pun intended) throwing me a curve.

[Georg_Unterberg]

hi don1reed,

if you hover with your mouse over the "ship time" 16:00 in lower right screen you get an additional local time reading - does the local time also show 16:00?

edit (my theory):
i could bet it shows you 17:00, an indicator that you started the mission in timezone +1.
So if local time and ship time is different, the ship time reading (16:00) is NOT the real GMT. To get the real GMT for your almanac prog please subtract the time difference (local - ship time) from the displayed ship time.

In your example: (1700 local - 1600 ship) = +1h. GMT = 1600 - (+1h) = 1500

In your picture in SH3 you are seeing the sun at 15:00 GMT.


edit again:
Just saw your answer below. I refrain from my theory. I'll check this later...

Originally Posted by don1reed

woops...typo. Meant East of England. tnx Georg.

And tnx, van, for the explanation. I'll have to fumble around with it abit to get my sea-legs adjusted.

-...-

Georg, the date & time is correct as my pic shows; however, my Windows/print screen function peeled away some of the sun-glare and shows the Sun's position in the middle of the screen (roughly) where I believe, van, is referring with his pic. As you can see, the "Navigator's Star Finder" shows Hc for the Sun as 20° 21.0'. The closest I could get to that was about 29°...also show on my pic. 9° off (540nm) is not too good.

The non-linearity of the screen is (no pun intended) throwing me a curve.

[don1reed]

Georg, I'm in the Greenwich time zone.

Here's another example:



As you can see, we have the constellation Orion in the center of the screen.

Betelgeuse is 3° off
Bellatrix is 11.6° off
Rigel is 9.5° off
and over to the left a bit is
Procyon and its off by 14.75°

(Compiled a RW sight reduction on those number, btw, and it would put me 63° 58'N, 000° 19.8'W.) 634.7nm by great circle calc.from my actual fix.

So, I'm at a loss...except for cntl-left mouse. :hmm:

[vanjast]

Don1Reed :- Sorry but you are placing the sextant in the wrong (vertical) position.
Have a look at the image sequence below.

You are placing the bottom of the sextant on the sea horizon


Whereas you must place it so that it exactly fits on the screen (1024x768 resolution). On a bigger screen AFAIK you must fix it on the bottom of the screen


You then pan your screen view vertically until the horizon is on the bottom of your screen. Here I've lowered it a bit so that you can see the horizon/sea


When this alignment is done then can you take a reading.
Hope this makes it better

[vanjast]

Originally Posted by don1reed

So, I'm at a loss...except for cntl-left mouse. :hmm:

Remember that this is not a GPS nav system (like ctl-LMouse) so navigation is not
that accurate.
With this mod, I think it will be accurate to say that that this is the 'technology' that they had to deal with - sextant and tables. So there are going to be in accuracies in navigation.

I've limited my time acceleration to 256x and kept strict notes on times, speed, course, etc.. and found myself to be within 5nm after a 5 day blizzard. OK we don't have to take currents into acount, but it's only a game and a good education (for me) non-the-less

Having said that I found great enjoyment to pin-point my exact position after many days of overcast skies, rain, sleet and snow.

I'm getting soppy now
Must refill my glass